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A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera. De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The Sphere of the Cosmos; the Latin title is also given as Tractatus de sphaera, Textus de sphaera, or simply De sphaera) is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c ...
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The Bianco map (1436). The Bianco World Map is a map created by Andrea Bianco, a 15th-century Venetian sailor and cartographer who resided on Chios.This map was a large piece of a nautical atlas including ten pages made of vellum (each measuring 26 × 38 cm).
The hall was used as a reception chamber and its decoration with large geographical maps was designed to underline the glorious tradition that was at the very basis of Venetian power. The two globes in the centre of the hall date from the same period: one shows the sphere of the heavens, the other the surface of Earth.
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The centre of the Earth is the centre of the lunar sphere—the orbit of the Moon around the Earth. All the spheres rotate around the Sun, which is near the centre of the Universe. The distance between the Earth and the Sun is an insignificant fraction of the distance from the Earth and the Sun to the stars, so parallax is not observed in the ...
According to historian Christopher Wright it was a perfect example of the "entwining of crusading purposes in the Levant with the vigorous pursuit of Venetian interests along the way", as the Venetians used the expedition to try and put pressure on Emperor John II Komnenos to restore the trading privileges that he had revoked by trying to seize ...